如何在javascript中将datetime微格式转换为本地时间？

我有一个页面,当前正在使用日期时间微格式来显示时间戳,但我只显示了我自己时区的人类可读时间:

Friday, January 9, 2009 at 9:16 am (EST)

我想要做的是将abbr标签的innerHTML重写为相同的格式,但是在用户的本地时区.因此,对于西雅图的读者,上述内容应转换为:

Friday, January 9, 2009 at 6:16 am (PST)

我查看了Javascript Date对象,它允许我获取本地时区偏移量.但我有一些问题:

我没有看到从ISO-8601时间戳创建新Date对象的简单方法.(我想如果没有更快的方法,我可以解析子串或正则表达式.)

我没有看到获得时区命名缩写的方法.例如,对于西雅图的读者,我希望有时间将"(PST)"附加到最后,否则该用户不清楚时间戳已被转换(特别是如果他是常客和已经习惯了我的时代在EST).

Tony.. 5

这是我的代码解析ISO时间戳:

function isoDateStringToDate (datestr) {
  if (! this.re) {
    // The date in YYYY-MM-DD or YYYYMMDD format
    var datere = "(\\d{4})-?(\\d{2})-?(\\d{2})";
    // The time in HH:MM:SS[.uuuu] or HHMMSS[.uuuu] format
    var timere = "(\\d{2}):?(\\d{2}):?(\\d{2}(?:\\.\\d+)?)";
    // The timezone as Z or in +HH[:MM] or -HH[:MM] format
    var tzre = "(Z|(?:\\+|-)\\d{2}(?:\\:\\d{2})?)?";
    this.re = new RegExp("^" + datere + "[ T]" + timere + tzre + "$");
  }

  var matches = this.re.exec(datestr);
  if (! matches)
    return null;

  var year = matches[1];
  var month = matches[2] - 1;
  var day = matches[3];
  var hour = matches[4];
  var minute = matches[5];
  var second = Math.floor(matches[6]);
  var ms = matches[6] - second;
  var tz = matches[7];
  var ms = 0;
  var offset = 0;

  if (tz && tz != "Z") {
    var tzmatches = tz.match(/^(\+|-)(\d{2})(\:(\d{2}))$/);
    if (tzmatches) {
      offset = Number(tzmatches[2]) * 60 + Number(tzmatches[4]);
      if (tzmatches[1] == "-")
        offset = -offset;
    }
  }

  offset *= 60 * 1000;
  var dateval = Date.UTC(year, month, day, hour, minute, second, ms) - offset;

  return new Date(dateval);
}

不幸的是,它也没有处理时区缩写.你必须修改"tzre"表达式来接受字母,我知道在Javascript中处理时区缩写的唯一解决方案是有一个查找表,你可以在更改区域时手动保持最新状态夏令时.

这是我的代码解析ISO时间戳:

function isoDateStringToDate (datestr) {
  if (! this.re) {
    // The date in YYYY-MM-DD or YYYYMMDD format
    var datere = "(\\d{4})-?(\\d{2})-?(\\d{2})";
    // The time in HH:MM:SS[.uuuu] or HHMMSS[.uuuu] format
    var timere = "(\\d{2}):?(\\d{2}):?(\\d{2}(?:\\.\\d+)?)";
    // The timezone as Z or in +HH[:MM] or -HH[:MM] format
    var tzre = "(Z|(?:\\+|-)\\d{2}(?:\\:\\d{2})?)?";
    this.re = new RegExp("^" + datere + "[ T]" + timere + tzre + "$");
  }

  var matches = this.re.exec(datestr);
  if (! matches)
    return null;

  var year = matches[1];
  var month = matches[2] - 1;
  var day = matches[3];
  var hour = matches[4];
  var minute = matches[5];
  var second = Math.floor(matches[6]);
  var ms = matches[6] - second;
  var tz = matches[7];
  var ms = 0;
  var offset = 0;

  if (tz && tz != "Z") {
    var tzmatches = tz.match(/^(\+|-)(\d{2})(\:(\d{2}))$/);
    if (tzmatches) {
      offset = Number(tzmatches[2]) * 60 + Number(tzmatches[4]);
      if (tzmatches[1] == "-")
        offset = -offset;
    }
  }

  offset *= 60 * 1000;
  var dateval = Date.UTC(year, month, day, hour, minute, second, ms) - offset;

  return new Date(dateval);
}

不幸的是,它也没有处理时区缩写.你必须修改"tzre"表达式来接受字母,我知道在Javascript中处理时区缩写的唯一解决方案是有一个查找表,你可以在更改区域时手动保持最新状态夏令时.